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help / color / mirror / Atom feedFrom: Tom Lane <tgl@sss.pgh.pa.us>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Use default limitOption in subquery generated for MIN/MAX index
Date: Fri, 18 Sep 2026 15:02:24 +0000
Message-ID: <E1x7a6a-00000000H99-3AgL@gemulon.postgresql.org> (raw)
Use default limitOption in subquery generated for MIN/MAX index scan.
We unintentionally copied the original query's limitOption field while
building the modified subquery. If it was LIMIT_OPTION_WITH_TIES,
that behavior would propagate through to execution, potentially
causing a "more than one row returned by a subquery used as an
expression" error. Fix by resetting to the default LIMIT_OPTION_COUNT.
This bug dates back to the introduction of WITH TIES.
Bug: #19694
Reported-by: Chaitanya Choudhary <chaitanyyachoudhary@gmail.com>
Author: Chaitanya Choudhary <chaitanyyachoudhary@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/19694-4e61bd0475398eef@postgresql.org
Backpatch-through: 14
Branch
------
REL_15_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/47c43ffdae795e382903c63fd2169daa6b13be30
Modified Files
--------------
src/backend/optimizer/plan/planagg.c | 1 +
1 file changed, 1 insertion(+)
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To: pgsql-committers@postgresql.org
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Subject: Re: pgsql: Use default limitOption in subquery generated for MIN/MAX index
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